Sound reproducer and recorder.



W. J. TRAVBRS. SOUND REPRODUGER AND RECORDER.-

APPLIGATION FILED JUNE 30, 1913 1,1 31,442. Patented Mar. 9, 1915.

ATTORNEYS ,a simple, reliable and inexpensive sound m e W's"- ru .1

Q? cen or rear 'WILLLIAIII a. or BUFFAIG, new "roan.

SOUND REPRODUCER AND BECORIWJR.

Specifi ation. of Letters Patent.

Patented Mar. 9, 122 155.,

Application filed June so, 1913. Serial at. Wes-as.

dent of Bufialo, in the county of Erie and State of New York, have invented a new and Improved Sound Reproducer and Becorder, of which the following is a full, clear, and exact description.

My invention relates to sound reproducers and recorders and has reference more particularly to the stylus bar and its armature; in which magnetic means are used for maintaining the stylus bar armature in a. predetermined position.

An object of the invention is to provide reproducer and recorder in which the amplitude or the time of vibration of the same is varied. I 7

Another object of the invention is to proyide means for maintaining the stylus bar armature upon its bearings.

Another object of the invention is to provide a sound producer and recorder in which the friction of the stylus bar armature bearings is reduced to a minimum.

A further object of the invention is to provide a stylus bar of reduced weight without reduction in strength. 1

Figure 1 is front elevation of an embodiment'of my invention; Fig. 2 is a sec.

tion on line 2 2, Fig. 1; Fig. 3 is a modified form of stylus bar armature bearings; Fig. 1- is a section on line 1-4, Fig. 3; Fig. 5 is another modified form of mounting of the stylus bar armature journalings; Fig. (5 is a section on line 6-6, Fig. '5; and Fig. 7 is another form of mounting the stylus bar armature so that the same oscillates longitudinally with respect to the poles of the magnet.

Before proceeding to a more detailed description of my invention, it must be clearly understood that the magnets may be of any suitable shape or form, formed of a single magnet or as a magnetic battery. The magnet may be secured about the lateral wall of the device, or it may form part of its lateral wall. set of magnets may be used for retaining the stylus bar armature upon its journals or bearings while another magnet or group of magnets may act upon the stylus bar armature so as to vary its time of vibration.

Referring to the drawings, 10 rep Furthermore, a magnet or.

a chambered body of ordinary construction, as used 1n sound reproducers and recordv which receives a. diaphragm 11 suitabir;

clamped within the. chambered body 10 a} meanspf rubber rings 12 at each. side of the diaphragm and adjacent the lateral. wall of the chambered body. The chambered body 10 has at one end a centrally aperturcd collar 13 which .is adapted to engage the horn. The other end of the dia phragm has a large opening substantially' equal to the inner diameter of the rubber ring 12. These parts of the invention are common in the art and do not form part of my invention.

Secured to the center of the diaphragm 11 on the side opposite the one facing the collar 13 is a stylus bar 14, preferably hollow (see Fig. 1). The stylus bar projects out of the chambered body 10 with its axis substantially parallel to the ends of the chambered body and the sides of the diaphragm. The stylus bar at its free end is provided with a mass forming a needle holder 15 which increases the inertia of the stylus bar. The stylus bar 14 adjacent the needle holder 15'is provided with a plate 16 extending transversely of the axis of the chambered body.

Positioned on the lateral wall of the chambered body 10 is a magnet 17, the poles 18 and 19 of which are provided with central knife-edged projections 20 and 21. The projections 20 and 21 are in alinement with each other and lie in a line perpendicular to the axis of the chambered body and pass through the axis of the stylus bar.

The said projections engage the plate 16 centrally by cutting slightly into the same. The plate 16, which is of such material that it is influenced by the magnetic force of the poles 18 and 119, is caused by the same .to be in engagement with the projections 20 and 21. Theplate 16, which forms the armature of the stylus bar, is, therefore, journaling on the knife projections 20 and 21 about which the stylus bar can oscillate. The magneticattraction of the poles 18 and 19 will. maintain the armature in a predetermined position, that is, when the stylus bar is in normal position the plate 16 will be parallel to the end surfaces of the poles 18 and 19.

if Let us' assume that the diaphragm 11 is caused to vibrate. This will cause the stylus 21. This displacement of the stylus 'bar of the diaphragm will cause. the side of the plate 16 facing the poles .18 and 19 to form an angle with the same, thereby increasing the attraction toward one edge while de-.

creasing it at the opposite edge of the plate.

The displacement of the bar produced by the diaphragm will be intensified by the magnetic action of the poles, thereby influencing the time of the oscillation and the oscillation of the stylus bar. Similar results will be obtained when the stylus bar is caused to oscillate by a record. The influ-' ence produced by the magnetic poles l8 and 19 on the armature of the stylus bar will increase the sensibility of the sound repro ducer and recorder.

In Figs. 3 and 4, poles 18 and 19 are provided on the exterior sides with portions 22 projecting slightly below the poles proper and having sharp points :23. On these points is pivotally mounted the plate 16 by engaging the said pointswith its edge ends. This mounting of the armature of the'stylus bar makes the same pivotal on an axis, which is transverse to the axis of the chambered body and which axis also passes through the axis of the stylus bar.

In Figs. 5 and 6 the stylus bar armature journals on the sides of the ends of the poles. .The poles 18,, and 19 have their faces lying in the plane parallel to the side of the magnet. these faces being centrally provided with knife edges E30 and 21,. The armature plate 16,, in this case, lies in a plane parallel to the face of the magnet or the sides of the diaphragm. The ends of the pole are preferably provided with a recess into which the ends of the plate are fitted, as can be easily seen from Figs. 5 and 6.

In Fig. 7 the journal for the armature plate 1.6. is a sharply pointed member, positioned between the poles 18 and 19,, on which the armature plate is balanced, there being no connection whatever between the armature plate and the poles of the mag net. This provision renders the armature plate more sensitive, as it is free to oscillate in any plane, being mounted on a single point; while the structures disclosed in Figs. 1 to 6 inclusive are only adapted to oscillate in a plane perpendicular to the plane of the diaphragm.

While, as stated in the description, the stylus bar is preferably hollow in structure, asolid stylus bar may be used if desired. Also in the above specification I described in detail a few ways of journalin the stylus bar. Changes in the details 11d arrangement of these various mountings may be made without departing from the underlying spirit of the invention, as pointed out in I the ap ended claims.

Having thus described my invention, I claim as new and desire to secure by Letters Patent:

1.111. a sound reproducer and recorder, a stylus bar; a support for the stylus bar; a magnet; and means associated with the magnet and said support forming the axis of oscillation for said stylus bar, said magnet adapted to maintain said support and stylus bar in a predetermined position.

2. In a sound reproducer and recorder, a stylus bar; a support for the stylus bar;' and a magnet having means-engaging said support whereby said support is spaced from the poles of the magnet, said means forming the axis of oscillation for the stylus bar and wliereon the oscillation of the bar is influ armature, whereby the poles of the magnetv are spaced from the armature."

5; In a sound reproducer and recorder, a stylus bar; an armature for said stylus bar; a bearing for said armature on which the stylus bar is adapted to oscillate; and magnetic means forcing the armature in engage ment with the bearing and also adapted to influence the displacement of the stylus bar on the bearing that may be produced by the vibration of the diaphragt or the movement of the record.

6. In a sgund rcproducer and recorder, a stylus bar and magnetic means havingbearings at the poles, said bar having means spaced from the poles of the magnet and in engagement with said bearings.

-7. In a sound reproduccr and recorder, a.

means associated with said bearings, the

poles of the magnetic means being spaced from the support, said poles tending to maintain's'aid support in normal position on said bearing.

9. In a sound reproducer and recorder, a hollow stylus bar; a supportv for the stylus bar; a bearing for said support on which maintain the same in normal position.

10. In a sound reproducer and recorder, a

- cone-shaped hollow stylus bar; a support for the bar; bearings for said' support on which the stylus bar is adapted to oscillate;.

and magnetic means the poles of which are spaced from said support and which tend to maintain thesame in a predetermined position. Y

11. In a sound reproducer and recorder, a stylus bar, a support for said stylus bar, and a magnet having means engaging the sup port and spacing the same from the poles thereof, said means pivotally connecting said support to the magnet.

12. In a sound reproducer and recorder, a stylus bar, a support therefor, a magnet associated with the support, and means intermediate the support and the poles of the magnet rendering said support pivotal and spacing the same from the poles of the magnet.

13. In a sound reproducer and recorder, a stylus bar, a support for the stylus bar, and a magnet the poles of which are shaped to form the axis of oscillation for the stylus bar, and Whereon the oscillation of the bar is influenced by the said magnet.

14 In a sound reproducer and recorder, a magnet and a stylus bar, said stylus bar and magnet poles having contacting means forming the axis of oscillation for said sty lus bar.

In testimony whereof I have signed my name to this specification in the presence of two subscribing Witnesses.

WILLIAM J. TRAVERS.

Witnesses: HENRY Knmss,

I'IARRY W. LAUER. 

